
even samples to recover the odd samples, and finally the original signal is
recovered by merging them.
Lifting provides many benefits. Lifting steps can be calculated in place,
which means prediction and update results at one stage can be replaced with
the results at the next stage, which can be important for memory-limited
systems. Lifting also permits an integer transform by rounding off the result
of the filter (P or U ) right before adding or subtracting [21], and the system
remains invertible.
Another method of invertible integer wavelet transform uses modular arith-
metic to fix the dynamic range [22]. For example, if the input is an 8-bit image,